DAYTON, Ohio (AP) — The running mates are leading the latest charges in the presidential battleground state of Ohio.

Vice President Joe Biden campaigns Wednesday at Wright State University in Dayton, while Republican VP candidate Paul Ryan heads to the Clermont County Fairgrounds east of Cincinnati.

President Barack Obama's campaign says the Democrat will return to Ohio next Monday with stops in Columbus and Cincinnati.

GOP presidential nominee Mitt Romney was in Mansfield two days ago.

Polls have indicated a tight race with Obama slightly ahead in the swing state, considered likely to be crucial to Romney's chances of unseating him. Obama carried Ohio in 2008, after George W. Bush won Ohio twice.

Wright State had a role in the 2008 race: Republican John McCain introduced Sarah Palin as his running mate there.